gnu vs wildebeest

gnu and wildebeest both are nouns.

Word	Noun	Adjective	Verb	Adverb
gnu	Yes	No	No	No
wildebeest	Yes	No	No	No

As nouns, gnu and wildebeest are synonyms defined as:

gnu and wildebeest: large African antelope having a head with horns like an ox and a long tufted tail

gnu (noun)	wildebeest (noun)
large African antelope having a head with horns like an ox and a long tufted tail	large African antelope having a head with horns like an ox and a long tufted tail